Wait, that's what some countries do--ground floor != first floor.

Yes, in good old Blighty, for one (or, should I say, for zero).

I remember counting from 0 when I was young, while all the other kids counted from 1. I considered myself right then and still do. That was well before I had any exposure to programming. Guess I was born for this profession.

Fence-post error. Are you counting the floors themselves or the distance from the ground?

I was actually trying to figure out where my window was on the outside of an office building I work in (5th floor). So I started with 0 which would have meant I would be looking at the 6th floor, not 5th.